		var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

				function Base64decode(input) {
					var output = "";
					var chr1, chr2, chr3;
					var enc1, enc2, enc3, enc4;
					var i = 0;
					input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
					while(i < input.length) {
						enc1 = _keyStr.indexOf(input.charAt(i++));
						enc2 = _keyStr.indexOf(input.charAt(i++));
						enc3 = _keyStr.indexOf(input.charAt(i++));
						enc4 = _keyStr.indexOf(input.charAt(i++));
						chr1 = (enc1 << 2) | (enc2 >> 4);
						chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
						chr3 = ((enc3 & 3) << 6) | enc4;
						output = output + String.fromCharCode(chr1);
						if(enc3 != 64) {
							output = output + String.fromCharCode(chr2);
						}
						if(enc4 != 64) {
							output = output + String.fromCharCode(chr3);
						}
					}
					output = decode(output);
					return output;
				}

				function decode(utftext) {
					var string = "";
					var i = 0;
					var c = c1 = c2 = 0;
					while(i < utftext.length) {
						c = utftext.charCodeAt(i);
						if(c < 128) {
							string += String.fromCharCode(c);
							i++;
						} else if((c > 191) && (c < 224)) {
							c2 = utftext.charCodeAt(i + 1);
							string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
							i += 2;
						} else {
							c2 = utftext.charCodeAt(i + 1);
							c3 = utftext.charCodeAt(i + 2);
							string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
							i += 3;
						}
					}
					return string;
				}

				function Base64() {

					// public method for encoding  
					this.encode = function(input) {
						var output = "";
						var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
						var i = 0;
						input = _utf8_encode(input);
						while(i < input.length) {
							chr1 = input.charCodeAt(i++);
							chr2 = input.charCodeAt(i++);
							chr3 = input.charCodeAt(i++);
							enc1 = chr1 >> 2;
							enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
							enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
							enc4 = chr3 & 63;
							if(isNaN(chr2)) {
								enc3 = enc4 = 64;
							} else if(isNaN(chr3)) {
								enc4 = 64;
							}
							output = output +
								_keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
								_keyStr.charAt(enc3) + _keyStr.charAt(enc4);
						}
						return output;
					}
				}
				_utf8_encode = function(string) {
					string = string.replace(/\r\n/g, "\n");
					var utftext = "";
					for(var n = 0; n < string.length; n++) {
						var c = string.charCodeAt(n);
						if(c < 128) {
							utftext += String.fromCharCode(c);
						} else if((c > 127) && (c < 2048)) {
							utftext += String.fromCharCode((c >> 6) | 192);
							utftext += String.fromCharCode((c & 63) | 128);
						} else {
							utftext += String.fromCharCode((c >> 12) | 224);
							utftext += String.fromCharCode(((c >> 6) & 63) | 128);
							utftext += String.fromCharCode((c & 63) | 128);
						}

					}
					return utftext;
				}
